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783 posts

Ultimate Geek
+1 received by user: 343


# 242501 31-Oct-2018 14:38
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Up until recently we have been happily using Azure AD MFA, with a mixture of users using the app, and some electing to receive a voice call. At some stage recently, calls to NZ land lines stopped working. People using mobile phones are still receiving the verification call, but those using Vodafone and Spark land lines do not get called. Our telco does not see any incoming calls from the source phone number, and is pushing back saying the problem is at Microsoft's end, which my feeling is that it's probably the case.




What do you guys reckon has happened?





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783 posts

Ultimate Geek
+1 received by user: 343


  # 2117843 1-Nov-2018 13:48
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To bring closure to this, the source phone number for the MFA call was being blocked by both Vodafone and Spark, but only for landlines. Our provider stated to us that there were no calls logged from that number in the days it wasn't working. They didn't say that it was blocked however. I interpret this to mean that either they share a block list, or there is a mechanism upstream from both providers for blocking. Either way, changing the source phone number got it working. It is concerning that this can happen though.





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